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[95.25.158.125]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-39b1d81c80fsm5833681fa.4.2026.06.30.06.02.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jun 2026 06:02:11 -0700 (PDT) From: Igor Putko To: sj@kernel.org, akpm@linux-foundation.org Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, IgorpetinDev Subject: [PATCH] mm/damon/vaddr: remove redundant RCU lock Date: Tue, 30 Jun 2026 16:01:58 +0300 Message-ID: <20260630130158.3826-1-igorpetindev@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260629165349.4260-1-igorpetindev@gmail.com> References: <20260629165349.4260-1-igorpetindev@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: E0D0C1C0019 X-Stat-Signature: 1ztesjkfwn93nt46p5ztwcrtnreur8ys X-HE-Tag: 1782824535-366047 X-HE-Meta: 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 fW5Ir/vg 7xcnBhFlyt33czf6s7l9LGq8K/ftj9PIoNsbEkh+Ozn8lQDa3K3ZGQMtACI8WcjS3fDCsOf1pXKFdqfYLOtC544wO6NeW1gU9c4O08o+3npV7erPodpAAs7axBrIEm0+TTbBcWOd85jDf8Ojrxpo17kIPXYpMew4wVHrfczR/NtPYRt18vqXOLHTqkMK8tFD4oZhuuZbVnZ7o9KEvEBAhUrfGsVY1uYbJoQYQqhx0o6XdV5rGH12LmLjvy9NVLMwY5M+Z4hV5nffh/ZzDl4CAzBd6Ddb6oSUgzFbNTZDW2Gidx0meeXmGyJR5LYo5zlQ3I47+G2PgZQmcTaJhDLuAWFjy4WbbIoFyJ9RSAYHMh1Cu4+Ksefcmo+WFUxktcOR0uLqQ8Gq1PYzxiXG3QFSuJEa+UqvO1vZjjLFTNwZ3xjhWcWJiXuSfMTehKrfQdiXRbt/uGB+Y+KVxSiyIfC8FU+TrhQ/N2PYVo/77qW1RWxnWmldCZeamGFNKww== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: IgorpetinDev __damon_va_three_regions() is called only by damon_va_three_regions(), which already holds mmap_read_lock(). Since mmap_read_lock() is held, the maple tree and VMA list are protected from concurrent changes. Remove the unnecessary rcu_read_lock() and rcu_read_unlock() calls. Signed-off-by: IgorpetinDev --- mm/damon/vaddr.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index d27147603..345b89b5d 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -84,7 +84,6 @@ static int __damon_va_three_regions(struct mm_struct *mm, * If this is too slow, it can be optimised to examine the maple * tree gaps. */ - rcu_read_lock(); for_each_vma(vmi, vma) { unsigned long gap; @@ -105,7 +104,6 @@ static int __damon_va_three_regions(struct mm_struct *mm, next: prev = vma; } - rcu_read_unlock(); if (!sz_range(&second_gap) || !sz_range(&first_gap)) return -EINVAL; -- 2.47.3